Sparking device.



' W. FALWELL.

SPARKING DEVICE. APPLICATION I ILBD 001.10, 1910.

Patented July 25, 1911.

lvv'va raidr.

UNITED sT TEs PATENT OFFICE.

ING COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

SPARRING DEVICE.

. Specification of Letters Patent. Patented July 25, 19.11

Application filed October 10, 1919. Serial No. 586,148.

To all whom it may concern:

Be it known that I, TRAY -FALwnLL, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Sparking Devices, of which the following is a specification.

My invention relates to sparking devices for use in internal combustion engines and its objects are to preventthe parts from being readily disassociated by reason of the shaking of the same, to render the sparking terminal points more accessible and to provide a means for more securely holding the insulation in place.

My invention consists in constructing'a metal shield in which the insulation is in serted from below and which has a seat to prevent said insulation from beingnioved in any direction except downwardly, the insulation being provided with an enlargement for securing the same in said shield by means of a cap-threaded to engage with said shield from'below, and the lower portion of said shield closed by said cap engaging with and being inclosed by a shell electrode, whereby the escape of the insulation from the shield by the shaking loose of said cap is effectually prevented. M

My invention further. consists in the several "arrangements and modifications illustrated in the drawings and hereinafter more specifically described and claimed.

Attention is hereby directed to the drawing, in whichsimilar numerals of designation refer to similar parts throughout the several views. Figure 1, is a side elevation of my improved sp. rking device. 2, is a vertical section ofthe device shown in; Fig. 1, the insulation, however, being shown intact. Fig. 3, is a view of the device shown in Fig. 1, looking at the same from below.

Referring to the drawing, the shield 3, constructed-of metal or any other suitable. material, is made with an annular seat 4, upon which is placed a gasket or packing 5. VVi'thin the said shield is inserted the insulation 6, which is preferably constructed with a taper toward its out-side end. A little below the middle portion of said insulation is the enlargement 7, which is shaped to en-.

gage with the interior of the shield 3, and to come in contact with the packing 5.- The lower portion of said shield is closed by a cap 8 which is threadcd to engage with the same, the cap 8, having the interior opening 9,for the purpose of allowing the lower por tion-10 of the insulation 6, to protrude therethrough. On the exterior of the lower portion of said shield 3, a thread is provided for the purpose of permitting the same to engage with the shell electrode 11, which is shaped to be secured to an opening communicating with the combustion chamber, the copper ring-19 separating said shield and elect ode at. the exposed line of juncture. .At the top of said insulation is a cap 12, the rim of which extends down upon said insulationand is soldered-to the same. Upon -s cap 12, is located' the binding screw 13, ,t-..rough which extends (as well as through the said'eap 12 and insulation 6), the electrode stem 14, which. terminates at the bottom thereof in a sparking point 15, which is in 'close engagement with the sparking loop 16.

the same loose and thus result in the escape ,.,of the insulation. Were the opening at the [outer portion of the shield 3 made larger and'the insulation inserted from above and secured by threaded collar or cap to the shield' 3, there would be constant danger particularly where the device is used for motor vehicles that the. said collar or cap would become loosened, at which time the insulation is likely tobecome detached from the shield and to jump therefrom.-

I havediscovered that in the use of my improved sparking device where the insulation is secured as above specified, there is.

little or no danger of the insulation working loose, the thread of the shield 3, at. its lower portion being of such extent, and the power applied to the nut shaped portion thereof 17,

being necessarily so great as to prevent the disassociation of the shield 3, from theelectrode shell 11, whereas in respect to the threaded engagement of the cap 8, with the shield 3, it is impossible to secure the sa me so tightly that it will not work loose to some extent, it heing obyious that were the said cap screwcdfdoxiin ,too firmly itwmight result in breaking or cracking the insula- "so vary.

tion ,or cutting and destroying the screw threads. In my device the said cap being entirely surrounded there is -no possibility oi the same being shaken clear of the shield and so permitting the-escape of the insulation 6. It will further be observed that a further advantage of my new arrangement of parts arises from the fact that the alinement of the screw threads is such the stem electrode and insulation may be taken out as a whole, cleaned and replaced without rendering it necessary to make a readjust-- ment of the electrode sparking points, all of the devices now on themarlret requirin a disassociation and further adj li'illlellll or the parts before the said points can be satisfactorily cleaned and replaced.

While I have described in y invention with particular reference-to the preferred form herein illustrated means desire to limit myself to the specific form of said device, it being obvious that the same could be variously modified without departing from the spirit of my invention. k

The employment of the loop 16 as a sparking terminal is also important, the ends thereof being embedded in the shell electrode, and there being no exposed points to be bent out of proper position or to expand and contract with the heat or cold and the distance between them.

\Vhat I claim and desire to secure by Letters Patent is v 1. A- sparking device composed of two separable parts, one part consisting ofan clectrode, an insulating sleeve with an enlargement therein inclosing said electrode, a metallic shield surrounding the same and detachable-means for securing said shield by said enlargement, and the and-described, I by 110 said sleeve to enlargement in but one direction, and nieans said passageway and preventing the escape of said sleeve; and the other part consisting of a shell electrode adapted to be secured to and to conununicatewith a combustion chamber, and shaped to engage with said shield and inclose said closure means.

3. In a spark ng device a removable terminal consisting of an electrode stem, a tapering insulating sleeve surrounding said stem and having an enlargement therein a for closing -shield having a seat therein encircling said sleeve and engaging with said enlargement, a cap having a shank threaded to engage with said shield below said enlargement and to abut against and secure the same, combined with a shell electrode having its lower end threaded to engage with an opening in a combustion chamber, and having an annular recess therein threaded to engage with said shield and surround and cover the end of the same closed by said cap.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses, this 8th day ofOctober' 1910.

. vVltAY FALl VELL.

Witnesses LI'LLIAN l WiiinNnn, Josnrit W. Lnwrs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. G. 

